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OpenStudy (anonymous):
The first term of a geometric sequence is 64, and the second term is 16. Find the fifth term. Can someone help me?
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OpenStudy (anonymous):
Call the terms: \[a + ar + ar^2 + .... + ar^{n-1} \] a = 64 ar = 16 => r = ... n = 5 So last term is \[ ar^{5-1} = ar^5 = ...\]
OpenStudy (anonymous):
so the answer is 4000?
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